Self-restoring annunciator.



A. C. REID.

SELF RESTORING ANNUNCIATOR.

APPLICATION FILED AUG. 18. 1913.

1 ,138,688. 7 Patented May 11, 1915.

THE NORRIS PETERS c0. PHOTO-LITHOV. \VASHINCTDN. u. C

UNITED STATES PATENT oEEioE.

ALEXANDER damn, OFGENOA, ILLINOIS, nssr'civon T0 GRACRAFT, LEIGH ELECTRIC company, or cENoaiL INoIs.

SELF-RESTORIN G ANNUNCIATOR.

Application filed August 18, 1913.

To all whom it may concern:

Be it known that I, ALEXANDER C. REID, a citizen of theUnited States, residing at Genoa, in the county of Dekalb and State of Illinois, have invented a certain new and useful Improvement in Self-Restoring Annunciators, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to self-restoring annunciators and has for its object the provision of an annunciator of this type in which an auxiliary coil having an armature may be used to restore a drop shutter, which drop shutter is normally controlled by the armature of the main electromagnet of the device. My invention thus provides an an-' nunciator which can readily be used for magneto multiple switchboards because the same is electrically self-restoring and which is of such character that a busy test is readily associated therewith.

In one form of carrying out my invention I use the ordinary drop coil to actuate the armature which controls the drop shutter and then mount below this coil an auxiliary coil having an armature and lever to restore the drop shutter whenever a circuit is completed through this auxiliary coil. In this same form I have a local circuit through the auxiliary coil which preferably includes the thimbles of the jacks to thereby provide a busy test, which of course is a necessary part of multiple switchboards.

I will explain my invention more in detail by reference to the accompanying drawings, illustrating one form thereof, in which Figure 1 is a side View, partly in section, of my improved self-restoring annunciator; Fig. 2 is a top view thereof; and Fig. 3

shows diagrammatically the circuit arrange-.

ment thereof in connection with the busy test feature as applied to a multiple switchboard.

Referring more particularly to Figs. 1 and 2, I have a front plate 1 which is of metal, but from which all of the parts mounted thereon are insulated. This is due principally to the use of insulating strips 2 and 3 and the use of insulated screws for holding the parts in position. The front plate carries a framework 41 which extends Specification of Letters Patent,

Patented May 11, 1915. Serial No. 785,406.

to the right (Fig. l) and which framework has upwardly extending side walls 5, 5. Between these side walls a bridge 6 of nonmagnetic material is fastened, which carries a pole plece 7 of magnetic material through which the core 8 of the electromagnetic coil 9 passes. The coil is formed integrally with a finger 11, by means of which thiscoil is fastened to the framework at through the interposition of the screw 12. The armature 13 is pivotally mounted at 14:, as shown, and controls a drop shutter 15 pivoted at 16. The drop shutter has a finger 17 which extends into an opening 18 provided in the front plate to accommodate this finger. Below the framework 4 I mount an auxiliary coil 19 which controls an armature 20 having a restoring rod 21. This restoring rod is adapted to engage the finger l'i, as more clearly apparent from Fig. 1. I/Vhenever the coil 9 is energized the armature 13 is attracted toward the pole piece 7, thereby releasing the drop shutter 15, which falls into the position shown in Fig. 1. The insertion of a plug in the jack, either the answering or multiple, completes a circuit through the coil 19 which thereupon attracts its armature 20, moving its arm 21 contraclockwise, thereby lowering the free end of the finger 17 and pushing the shutter 15 back into position where the catch 22, controlled by the armature 13, passes through an opening 23 and engages the front side of this shutter to hold it in position ready for a further actuation thereof should the coil 9 be again energized. The armature 20 is pivoted upon a spindle 24., as readily apparent from Fig. 1. These drops are of course to be preferably mounted in banks, as more clearly shown in Fig. 2. The coil 19 is held in place upon the underside of the framework 4: through the interposition of the L- shaped angle piece 25.

Referring more particularly to Fig. 3, I show the shutter-controlling coil 9 for controlling the shutter 15 and the auxiliary coil 19 which restores the shutter when current passes through this auxiliary coil. This structure forms one of the many multiple electromagnetic units which are provided in the multiple switchboard. Each electromagnetic unit is adapted for association with a plurality of jacks 26, 26, which jacks are either of the multiple or answering type,

as the case may be. These jacks are provided with back contacts, 27, 27, so that the coil 9 is cut out of the circuit whenever a plug is inserted in that particular jack. The plugs 28 have tip contacts 29, sleeve contacts 30 and thimble contacts 31. The thimble contacts are adapted for association with the thimbles 32 of the jacks 26. A circuit is completed which may be traced from the right-hand terminal of battery 33 through conductor 34:, conductor 35, coil 19, conductor 36, thimbles 32, 32, and when the plug is in the jack, through the thimble contact 31, conductor 37, conductor 38 to the left-hand terminal of the battery 33. It will thus be seen that whenever a plug is inserted in a jack, the auxiliary coil 19 is energized to restore the drop shutter and at the same time live battery is supplied to the thiinbles 32. Now should another call be received for that same line, then the operator, using a second cord circuit, would close her listening key 39, and touch the tip contact 29 to the thim'ble 32. Assuming that the left-hand terminal of the battery is connected to the thimble 32 through some other already connected plug, then the circuit might be traced for this busy test beginning at the left-hand terminal of the battery 33 to the thimble 32, tip 29, conductor 40, conductor 41, spring 12, conductor 13, receiver 14:, conductor 45, coil 16, conductor 47, to ground at -18, the righthand terminal of the battery 33 being also Having, however, thus described one form which my invention may take, what I claim as new and desire to secure by Letters Patent is:

An annunciator having a front plate, a framework mounted thereon but insulated therefrom extending rearwardly from said plate, a shutter having a depending finger on the front side of said plate, an electromagnet carried by said framework, an armature and shutter arm controlled thereby, a second electroniagnet mounted below said framework, beneath the first aforesaid electromagnet, and an armature and shutter restoring arm controlled by said second electromagnet, said shutter restoring arm extending through an opening in said front plate to engage said depending finger.

In witness whereof, I hereunto subscribe my name this eighteenth day of July, A. 1).,

ALEXANDER C. REID. l/Vitnesses OSCAR M. Lmcrr, MAX WV. ZABEL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. 0. 

